一种DSSS系统自适应门限分析模型

An Adaptive Threshold Analysis Model for DSSS System

自适应门限是影响直接序列扩频(DSSS)系统平均捕获时间的关键因素。为达到降低DSSS系统平均捕获时间的目的,文中通过深入分析非相干累加与虚警概率、检测概率、平均捕获时间的关系,建立了一种DSSS系统自适应门限分析模型。仿真结果表明,该分析模型可通过自适应门限阈值来有效降低DSSS系统的平均捕获时间,进而为工程应用中的门限自适应提供理论依据。

The adaptive threshold is one of the key factors influenceing the mean acquisition time. In order to decrease the mean acquisi- tion time, an adaptive threshold analysis model was established by analizing the relationships among non coherent accumulation, false alarm probability, detection probability and mean acquisition time. Simulation result shows that using the analysis model to adjust the adaptive threshold was an effective mehtod to decrease the mean acquisiton time, which could provide theoretical basis for engineering application.